Provided herein are chimeric and humanized versions of anti-CD22 mouse monoclonal antibody, HB22.7, which comprise human or humanized framework regions of the immunoglobulin heavy chain variable region (“VH”) and light chain variable region (“VK”). The FW regions may contain one or more backmutations in which a human FW residue is exchanged for the corresponding residue present in the parental mouse heavy or light chain. The human or humanized VH framework regions may comprise one or more of the following residues: a valine at position 24 of FW1, a glycine at position 49 of FW2, and an asparagine at position 73 of FW3, numbered according to Kabat. Further provided are pharmaceutical and immunotherapeutic compositions, and methods using anti-CD22 antibodies that preferably mediate human ADCC, CDC, and/or apoptosis for: the treatment of B cell diseases in humans, including B cell malignancies, autoimmune disease, GVHD, humoral rejection, and post-transplantation lymphoproliferative disorder.
